1220367161 has 16 divisors (see below), whose sum is σ = 1329432720. Its totient is φ = 1113523200.

The previous prime is 1220367139. The next prime is 1220367163. The reversal of 1220367161 is 1617630221.

It can be written as a sum of positive squares in 8 ways, for example, as 88717561 + 1131649600 = 9419^2 + 33640^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220367161 - 2²⁶ = 1153258297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220367163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 850901 + ... + 852333.

It is an arithmetic number, because the mean of its divisors is an integer number (83089545).

Almost surely, 2^1220367161 is an apocalyptic number.

It is an amenable number.

1220367161 is a deficient number, since it is larger than the sum of its proper divisors (109065559).

1220367161 is a wasteful number, since it uses less digits than its factorization.

1220367161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2156.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 1220367161 is about 34933.7538921886. The cubic root of 1220367161 is about 1068.6369113221.

Adding to 1220367161 its reverse (1617630221), we get a palindrome (2837997382).

The spelling of 1220367161 in words is "one billion, two hundred twenty million, three hundred sixty-seven thousand, one hundred sixty-one".